249749390 has 16 divisors (see below), whose sum is σ = 490417200. Its totient is φ = 90817920.

The previous prime is 249749389. The next prime is 249749413. The reversal of 249749390 is 93947942.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1135115 + ... + 1135334.

It is an arithmetic number, because the mean of its divisors is an integer number (30651075).

Almost surely, 2^249749390 is an apocalyptic number.

249749390 is a deficient number, since it is larger than the sum of its proper divisors (240667810).

249749390 is a wasteful number, since it uses less digits than its factorization.

249749390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2270467.

The product of its (nonzero) digits is 489888, while the sum is 47.

The square root of 249749390 is about 15803.4613297214. The cubic root of 249749390 is about 629.7499553611.

The spelling of 249749390 in words is "two hundred forty-nine million, seven hundred forty-nine thousand, three hundred ninety".